import type {
  LoginByAccountParams,
  LoginBySmsParams,
  LoginResult,
  RegisterParams,
  ResetPasswordParams,
  User,
} from '@/types/business/user'
import { isPhone, isValidPassword } from '@/utils/validate'

// TODO(api): 待接口文档到位后，将以下 mock 替换为 request<T> 调用（页面 → store → api 数据流不变）

const SIX_DIGIT_CODE = /^\d{6}$/

/** 发送短信验证码 */
export function sendSmsCode(phone: string): Promise<void> {
  if (!isPhone(phone)) return Promise.reject(new Error('手机号格式不正确'))
  return Promise.resolve()
}

/** 账号密码登录（mock：demo 账号可登录，其余提示先注册） */
export function loginByAccount(params: LoginByAccountParams): Promise<LoginResult> {
  const { account, password } = params
  if (!account.trim() || !password) {
    return Promise.reject(new Error('请输入账号和密码'))
  }
  if (account === 'demo') {
    const user: User = {
      id: 'u1',
      nickname: '王永志',
      avatar: '',
      phone: '186****618',
      email: 'yongzh******4@163.com',
      passwordModifiedAt: '',
    }
    return Promise.resolve({ token: `mock-token-${Date.now()}`, user })
  }
  return Promise.reject(new Error('登录失败，请先注册账号'))
}

/** 手机验证码登录（mock：验证码须为 6 位数字） */
export function loginBySms(params: LoginBySmsParams): Promise<LoginResult> {
  const { phone, code } = params
  if (!isPhone(phone)) return Promise.reject(new Error('手机号格式不正确'))
  if (!SIX_DIGIT_CODE.test(code)) return Promise.reject(new Error('验证码格式不正确，应为6位数字'))
  const user: User = {
    id: 'u1',
    nickname: '王永志',
    avatar: '',
    phone: '186****618',
    email: 'yongzh******4@163.com',
    passwordModifiedAt: '',
  }
  return Promise.resolve({ token: `mock-token-${Date.now()}`, user })
}

function validateAuthForm(
  phone: string,
  code: string,
  password: string,
  confirmPassword: string,
  agree: boolean,
): string | null {
  if (!isPhone(phone)) return '手机号格式不正确'
  if (!SIX_DIGIT_CODE.test(code)) return '验证码格式不正确，应为6位数字'
  if (!isValidPassword(password)) return '密码长度应为6-20位'
  if (password !== confirmPassword) return '两次输入的密码不一致'
  if (!agree) return '请先阅读并同意《用户协议》和《隐私政策》'
  return null
}

/** 注册 */
export function register(params: RegisterParams): Promise<void> {
  const message = validateAuthForm(
    params.phone,
    params.code,
    params.password,
    params.confirmPassword,
    params.agree,
  )
  if (message) return Promise.reject(new Error(message))
  return Promise.resolve()
}

/** 重置密码 */
export function resetPassword(params: ResetPasswordParams): Promise<void> {
  const message = validateAuthForm(
    params.phone,
    params.code,
    params.password,
    params.confirmPassword,
    params.agree,
  )
  if (message) return Promise.reject(new Error(message))
  return Promise.resolve()
}